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<p>The individual adsorption behaviors of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) were investigated and compared using granular activated carbon (GAC) and copper modified GAC (GAC–Cu) through batch experiments. Scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDS) analysis revealed that the Cu content (atomic wt. %) in GAC–Cu was 2.91 times higher than that in GAC, while the oxygen/carbon (O/C) ratio was similar, confirming that the surface of GAC has been changed by Cu. The increase in maximum uptake (q<sub>m</sub>) calculated from Langmuir isotherm model, was 52.7% and 51.9% for GAC and 90.0% and 99.7% for GAC–Cu, respectively, for PFOS and PFOA. GAC–Cu exhibited higher q<sub>m</sub> than GAC, with an increase of 23.6% and 44.6% for PFOA and PFOS, respectively. Adsorption capacity decreased with increasing initial solution pH, and the effect of Cu disappeared at a basic pH of 8.5. Kinetic experiments and model results demonstrated that the values of k<sub>1</sub> and k<sub>2</sub>, coefficients of adsorption rate, for PFOS and GAC–Cu increased by 101–197% and 13.2–55.9%, respectively.</p>

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Adsorption characteristics of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) in granular activated carbon (GAC) and modified GAC

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Jeongwoo Shin,
  • Byungryul An

摘要

The individual adsorption behaviors of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) were investigated and compared using granular activated carbon (GAC) and copper modified GAC (GAC–Cu) through batch experiments. Scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDS) analysis revealed that the Cu content (atomic wt. %) in GAC–Cu was 2.91 times higher than that in GAC, while the oxygen/carbon (O/C) ratio was similar, confirming that the surface of GAC has been changed by Cu. The increase in maximum uptake (qm) calculated from Langmuir isotherm model, was 52.7% and 51.9% for GAC and 90.0% and 99.7% for GAC–Cu, respectively, for PFOS and PFOA. GAC–Cu exhibited higher qm than GAC, with an increase of 23.6% and 44.6% for PFOA and PFOS, respectively. Adsorption capacity decreased with increasing initial solution pH, and the effect of Cu disappeared at a basic pH of 8.5. Kinetic experiments and model results demonstrated that the values of k1 and k2, coefficients of adsorption rate, for PFOS and GAC–Cu increased by 101–197% and 13.2–55.9%, respectively.